Maillard Reaction
The Maillard reaction is the chemical key to browning, crust formation and flavour depth. Understand the temperature zones, the acrylamide risk and why wet pans are the enemy.
In brief
The Maillard reaction is a non-enzymatic browning reaction between amino acids (from proteins) and reducing sugars at temperatures above approximately 120 °C. The result: brown crust colour, hundreds of new flavour and aroma compounds, and the characteristic "seared" aroma of meat, bread and coffee.
- Named after the French chemist Louis-Camille Maillard, who described the reaction in 1912 in his publication to the Academie des Sciences.
- Becomes noticeable around 120 °C on the product surface, with optimal browning between 140 °C and 165 °C. (Harold McGee, On Food and Cooking, Scribner 2004)
- Differs from caramelisation: Maillard requires amino acids; caramelisation is pure thermal sugar breakdown and only begins with sucrose around 160 °C.
- Surface water is the greatest enemy: liquid cannot exceed 100 °C, so the Maillard zone is never reached as long as moisture is evaporating.
- Above 180 °C pyrolysis (burning) sets in, causing harmful compounds such as PAHs and acrylamide to form more rapidly. (EFSA Journal 2015;13(6):4104)
Temperature zones
Phase 1
Water evaporation, no Maillard. The product dries and shrinks. No colour change, no new aromas.
Phase 2: Optimal
Maillard active. Light yellow to golden brown. Hundreds of new aroma compounds. This is the target zone.
Phase 3: Caution
Dark brown, intense aroma. Acrylamide starts to rise. Bitterness increases. Keep this brief.
Phase 4: Avoid
Burnt, bitter, black. High acrylamide. Harmful PAHs. Inedible and a HACCP risk.
Source: Modernist Cuisine, The Art and Science of Cooking (2011), The Cooking Lab.
Step-by-step method
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1
Pat dry
Pat the product completely dry with paper towels. Surface water boils off first (100 °C) before browning can begin. A wet surface delays the Maillard reaction by minutes.
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2
Room temperature
Let the product come to room temperature. A cold product cools the pan and creates steam, causing the surface to steam rather than sear.
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3
Heat the pan
Heat the pan on high until a drop of water evaporates instantly (Leidenfrost effect, approximately 200 °C surface temperature). Cast iron or stainless steel are preferred: excellent heat retention.
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4
Choose your fat
Use a fat with a high smoke point: clarified butter (approx. 252 °C), sunflower oil (approx. 232 °C) or peanut oil (approx. 232 °C). Regular butter smokes at around 177 °C. (Harold McGee, On Food and Cooking, 2004)
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5
Do not overcrowd
Place no more product in the pan than 70% of its surface area. Overcrowding lowers the pan temperature and causes steaming instead of searing.
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6
First contact, do not move
Place the product in the pan and leave it. Moving interrupts heat transfer and delays crust formation. Wait until the product releases from the bottom naturally.
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7
Colour control
Watch the colour progression: light yellow (light Maillard) to golden brown (optimal, approx. 140-165 °C surface) to dark brown (risky above 180 °C for acrylamide). (Modernist Cuisine, 2011)
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8
Flip
Flip the product when golden brown. For meat: flipping once gives the best crust. Frequent flipping distributes heat more evenly but produces a less intense crust.
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9
Monitor core temperature
Measure core temperature for food safety: beef minimum 55 °C (medium rare), 63 °C for safety. Pork 63 °C. Poultry 74 °C. (EU Regulation 852/2004)
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10
Rest
Let meat rest for 3-10 minutes after searing. Muscle fibres relax and meat juices redistribute. This is not optional but a technical necessity for juiciness.
Acrylamide: HACCP and EU regulation
Acrylamide, EU Regulation 2017/2158
- Acrylamide forms when the amino acid asparagine reacts with the reducing sugar glucose at temperatures above approximately 120 °C. Potatoes, cereal products and coffee are the primary dietary sources.
- EU Regulation (EU) 2017/2158 sets benchmark values (not hard limits, but indicative targets): fried potato products 750 µg/kg; potato crisps 500 µg/kg; wheat bread 80 µg/kg.
- EFSA (2015) concludes that dietary acrylamide may increase cancer risk for all age groups. EFSA Journal 2015;13(6):4104.
- Mitigation measures: lower frying temperature (max 175 °C for potatoes), shorter frying time, avoid burning, use potato varieties with lower sugar content for deep-frying.
- Hospitality obligation: where benchmark values are exceeded, demonstrable mitigation measures are mandatory (EU 2017/2158, Article 4).
Source: EU Regulation (EU) 2017/2158; EFSA Journal 2015;13(6):4104
Core temperatures when browning
| Product | Min. core (EU 852/2004) | Chef preference (texture) | Surface target |
|---|---|---|---|
| Beef (steak) | 63 °C | 55-57 °C (medium-rare) | 140-160 °C |
| Pork | 63 °C + 3 min rest | 65-68 °C | 145-165 °C |
| Poultry | 74 °C | 74-76 °C | 155-170 °C |
| Fish (fillet) | 63 °C | 55-60 °C (juicy) | 130-150 °C |
| Potatoes | Fully cooked | Crispy golden brown | Max 175 °C (acrylamide) |
Sources: EU Regulation 852/2004, Annex II; EU Regulation (EU) 2017/2158 (acrylamide)
Frequently asked questions
At what temperature does the Maillard reaction start?
What is acrylamide and when is it dangerous?
Why am I not browning my meat properly despite high heat?
What is the difference between the Maillard reaction and caramelisation?
How does salt affect the Maillard reaction?
Which products benefit most from the Maillard reaction?
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Food safety & HACCP
The HACCP guidelines, temperatures and storage advice on this page are based on Codex Alimentarius (WHO/FAO) as the global baseline standard and EU Regulation 852/2004. Local laws and regulations may differ. Always consult your national food safety authority for the applicable standards in your region:
- Netherlands: NVWA (nvwa.nl)
- Belgium: FAVV (favv-afsca.be)
- Germany: BfR (bfr.bund.de)
- United Kingdom: FSA (food.gov.uk)
- United States: FDA (fda.gov) — FDA Food Code
- EU general: EU Regulation (EC) 852/2004 on food hygiene
- International: Codex Alimentarius CAC/RCP 1-1969 (revised 2020)
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Allergen information is indicative. When in doubt about allergens in preparations, always contact the supplier or a certified allergological adviser. KitchenNmbrs accepts no liability for allergic reactions or diet-related harm.
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All sources mentioned (Escoffier, McGee, CIA Professional Chef, etc.) are the property of their respective publishers and authors. KitchenNmbrs cites these works in accordance with fair use for informational purposes. The source attribution at the bottom of each technique page is not a complete bibliography but an indication of primary sources consulted.
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- Harold McGee: On Food and Cooking (Scribner, 2004)
- Kenji Lopez-Alt: The Food Lab (W. W. Norton, 2015)
- Modernist Cuisine: The Art and Science of Cooking (2011)
- EU Regulation 2017/2158: acrylamide benchmark values
- EU Regulation 852/2004: food hygiene
